# The 'DriverPath' option is not a valid JAR file

**URL:** <https://community.cdata.com/t/the-driverpath-option-is-not-a-valid-jar-file/1127>\
**Category:** CData MCP Servers\
**Tags:** driverpath, jar-file, jdbc-setup, jdbc-error, jar-file-error, discussion, jdbc\
**Created:** [July 9, 2025, 1:57am UTC](https://community.cdata.com/t/the-driverpath-option-is-not-a-valid-jar-file/1127 "2025-07-09T01:57:31Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ben.hardcastle](https://avatars.discourse-cdn.com/v4/letter/b/ed655f/32.png) [@ben.hardcastle](https://community.cdata.com/u/ben.hardcastle)\
**Post date:** [July 9, 2025, 1:58am UTC](https://community.cdata.com/t/the-driverpath-option-is-not-a-valid-jar-file/1127/1 "2025-07-09T01:58:04Z")

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Hi,

I’m trying out the parquet server using the trial/beta JDBC.

When trying to run the server as described here:

> **[GitHub - CDataSoftware/parquet-mcp-server-by-cdata: This read-only MCP Server allows you to connect to...](https://github.com/CDataSoftware/parquet-mcp-server-by-cdata?tab=readme-ov-file#running-the-server)**
>
> This read-only MCP Server allows you to connect to Parquet data from Claude Desktop through CData JDBC Drivers. For full CRUD support, check out our MCP Server for Parquet (https://www.cdata.com/drivers/parquet/download/mcp).

I hit an error with my `driverPath` configuration in the .prp file:

`The ‘DriverPath’ option is not a valid JAR file`

- The path, on Windows, contains a space in it so I also tried enclosing in quotes, but received the same error.
- `java -jar&nbsp;PATH\TO\cdata.jdbc.parquet.jar` launches the config tool fine

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**Author:** ![jerodj-cdata](https://sea3.discourse-cdn.com/cdata/user_avatar/community.cdata.com/jerodj-cdata/32/7_2.png) [@jerodj-cdata](https://community.cdata.com/u/jerodj-cdata)\
**Post date:** [July 9, 2025, 5:52pm UTC](https://community.cdata.com/t/the-driverpath-option-is-not-a-valid-jar-file/1127/2 "2025-07-09T17:52:06Z")

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Hi Ben,

I think you’ll need to either escape the backslashes:

C:\\MCP\\cdata.jdbc.salesforce.jar

Or use slashes in the path:

C:/Program Files/CData/CData JDBC Driver for Jira 2024/lib/cdata.jdbc.jira.jar

Can you try either of these options to see if they work?

-Jerod

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<div class="post-metadata">

**Author:** ![ben.hardcastle](https://avatars.discourse-cdn.com/v4/letter/b/ed655f/32.png) [@ben.hardcastle](https://community.cdata.com/u/ben.hardcastle)\
**Post date:** [July 9, 2025, 6:11pm UTC](https://community.cdata.com/t/the-driverpath-option-is-not-a-valid-jar-file/1127/3 "2025-07-09T18:11:25Z")

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Hi Jerod,

Either of those works.&nbsp;Thank you very much!

Ben

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<div class="post-metadata">

**Author:** ![ben.hardcastle](https://avatars.discourse-cdn.com/v4/letter/b/ed655f/32.png) [@ben.hardcastle](https://community.cdata.com/u/ben.hardcastle)\
**Post date:** [July 9, 2025, 7:16pm UTC](https://community.cdata.com/t/the-driverpath-option-is-not-a-valid-jar-file/1127/4 "2025-07-09T19:16:08Z")

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Turns out the value for `JdbcUrl` also needs escaped backslashes, which aren’t included in the output generated by cdata.jdbc.parquet.jar.

All working now, and it’s very impressive! (using Copilot in VSCode with Claude Sonnet 4)